Ventilator.



(No Model.)

w. Jamison.

V E N T l L A T 0 R (Application led May 29, 1900.)

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Patented lune Il, |90l.

UNITED STATESr PATENT OFFICE.

WILLIAM B. JOHNSON, OF LIVERPOOL, ENGLAND.

VENTILATOR.

SPECIFIGATION forming part of Letters Patent N o. 676,259, dated June 11, 1901.

Application led May 29,

To all whom it may concern:

` Be it known that I, WTLLIAM BURGELAND JOHNSON, a subject of the Queen of GreatBritain, residing at Liverpool, in the county of Lancaster, England, have invented new and useful Improvements in Ventilators, of which the following is a specification.

The object of this invention is toprovide ya ventilator of simple construction by which the passage of air into a room may be directed so as to prevent drafts onto persons in such room and also be easily regulated or completely stopped, as desired. I attain this object by appliances such as are illustrated in the accompanying drawings, in Which- Figure l is a longitudinal section of a ventilator under my invention. l Fig. 2 is a longitudinal section of a modification ofthe ventilator. Fig. 3 is a longitudinal section of another modification. p 4

For thepurposes of my invention and referring to Fig. l, I make use of a box or frame a, fitting within an air opening or passage b through the wall c of the room or space to be ventilated. d e f g are curved vanes or plates fixed to the sides of the box and so disposed that air entering in the direction of thearrow is directed upward and prevented from blowing down onto persons in the room. One of the vanes e is made movable and is pro- Vided with side pieces or cheeks h, pivoted to the box at fi, so that such vane can be moved either to partly close the openings between the vanes or can be moved into the position shown by dotted linesto completely close-the ventilator and prevent entrance of air. The pivot t is preferably placed at such distance from the planeof the vane that the end of the vane will not project into the room when the ventilator is open, and Where the side pieces h pass through the vane CZ such vane is slotted to allow movement of the side pieces. The vane e is formed with an extension-piecej, movable with the vane and which acts to close the lower part of the ventilator when shut, and when open such extension-` piece prevents eddy-currents in the box, and guides the air in parallel layers to the vanes d e f g. In some cases when the atmosphere is still and the air in the room highly heated a current of hot air will pass out along the 1900. SerialNo.18,358. (Nomodel.)

top of the passage b, as shown by the dotted arrows, and a current of cold air will enter along the bottom, the extension-piece j enabling this to take place by preventing the interference of the two currents. The vanes may instead of being fixed to the box abe fixed to a loose frame tting into the box and which can be withdrawn therefrom for thepurpose of cleaning the vanes.

Referring to Fig. 2, in this modification the extension-piecej on the vane eis bent at 7o, so that a shorter length of extension-piece is required to eifect the closing than when it is straight. This is convenient when the veutilator is placed in comparatively thin walls. The bend t does not interfere with the inflow of air to any appreciable extent.

Referring to Fig. 3, in this modification there are only three vanes d e g, and the extension-piece j of the vane eis so arranged that the end beds on the lowest vane g when' the ventilator is closed, as shown by the dotted lines, a still shorter extension-piece j than that in Fig. 2 being used.

I do not` confine myself to the particular `modifications shown, as many others maybe devised without departing from my invention.

rect the air to any particular place the vanes maybe suitably arranged for that purpose.

I claiml. In a ventilator, the combination with an air-channel, of st-ationary vanes near one end thereof, and a movable vane between two of the stationary vanes and arranged to close the space between them, said movable vane having an extension arranged to close the space between other stationary vanes; substanltially as described. i

2. In a ventilator the combination with an air-passage of stationary vanes near one end thereof, a movable vanearrangedbetween the stationary vanes, side pieces attached to the movable vane, andhpivots on which the movable vane is hung by means of the side pieces, said movable vane having an extension arranged to close the space between other stationary vanes, substantially as described.

For instance, when it is desired to di-A IOO 3. In a ventilator the combination with an air-passage of stationary vanes near one end thereof a. movable vane arranged between name to this specification in the presence of the stationary vanos, and a, bent exteusontwo subscrlbing witnesses. y piece connected with the movable vane, said movable vane and extension piece being W' B' JOHNSON 5 adapted to close' the openings between the Vtnesses: l venes, substantially as described. ROBERT CRAIL,

In testimony whereof I have signed my HENRY DUGGAN; 

